National Parks/Monuments
Tribal BoundariesThe tribal boundaries shown here are provided by the Bureau of Indian Affairs
and are intended to be used as a general spatial reference only. They are not a formal
determination of tribal boundaries by the EPA.

National Parks/Monuments
Tribal BoundariesThe tribal boundaries shown here are provided by the Bureau of Indian Affairs
and are intended to be used as a general spatial reference only. They are not a formal
determination of tribal boundaries by the EPA.

National Parks/Monuments
Tribal BoundariesThe tribal boundaries shown here are provided by the Bureau of Indian Affairs
and are intended to be used as a general spatial reference only. They are not a formal
determination of tribal boundaries by the EPA.

AQI: Good (0 - 50)
Air quality is considered satisfactory, and air pollution poses little or no risk.

AQI: Moderate (51 - 100)
Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.

AQI: Unhealthy for Sensitive Groups (101 - 150)
Although general public is not likely to be affected at this AQI range, people with lung disease, older adults and children are at a greater risk from exposure to ozone, whereas persons with heart and lung disease, older adults and children are at greater risk from the presence of particles in the air.

Note: Values above 500 are considered Beyond the AQI. Follow recommendations for the Hazardous category. Additional information on reducing exposure to extremely high levels of particle pollution is available here.

Forecast Discussion: Saturday, an upper-level ridge of high pressure will remain over the Sacramento Valley, reducing vertical mixing in the atmosphere. In addition, calm to light winds at the surface will inhibit pollutant dispersion, and sunny skies combined with temperatures in the mid- to upper-90s will enhance ozone formation. Furthermore, smoke from wildfires burning in northern California may impact the region, further enhancing ozone formation. As a result, ozone levels will be Unhealthy for Sensitive Groups. Sunday, as an upper-level trough of low pressure approaches northern California, moderate onshore winds will disperse pollutants and bring cleaner, cooler air into the Sacramento region, lowering ozone levels to Moderate. Monday, mostly cloudy skies and cool temperatures will limit ozone formation, and scattered showers and gusty onshore winds will effectively disperse pollutants. As a result, ozone levels will be Good.